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Fair Value of Financial Instruments
3 Months Ended
Mar. 31, 2012
Notes to Financial Statements [Abstract]  
Fair Value of Financial Instruments
9.  
Fair Value of Financial Instruments

Roper's long-term debt at March 31, 2012 included $500 million of fixed-rate senior notes due 2019, with a fair value of $593 million, and $500 million of fixed-rate senior notes due 2013, with a fair value of $538 million, based on the trading prices of the notes, which is a Level 1 measurement in the FASB fair value hierarchy.  Short-term debt included $62 million of fixed-rate convertible notes which were at fair value due to the ability of note holders to exercise the conversion option of the notes.

The Company manages interest rate risk by maintaining a combination of fixed- and variable-rate debt, which may include interest rate swaps to convert fixed-rate debt to variable-rate debt, or to convert variable-rate debt to fixed-rate debt.   At March 31, 2012 an aggregate notional amount of $500 million in interest rate swaps designated as fair value hedges effectively changed Roper's $500 million senior notes due 2013 with a fixed interest rate of 6.625% to a variable-rate obligation at a weighted average spread of 4.377% plus the 3 month London Interbank Offered Rate ("LIBOR").

The swaps are recorded at fair value in the balance sheet as an asset or liability, and the changes in fair value of both the interest rate swap and the hedged senior notes due 2013 are recorded as interest expense. At March 31, 2012 the fair value of the swap was an asset balance of $11.1 million and was reported in other assets. There was a corresponding increase of $11.1 million in the notes being hedged, which was reported as long-term debt.  The impact on earnings for the three months ended March 31, 2012 was immaterial. The Company has determined the swaps to be Level 2 in the FASB fair value hierarchy, and uses inputs other than quoted prices that are observable for the asset or liability, including interest rates, yield curves and credit risks in order to value the instruments.